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Cheers Alex, yeah, you are right that the compression stuffs it. I wonder how to save the image from the 30-odd mb that it is as a .fits or .tiff, so that you don't suffer the artefacts and loss for posting on the web.
I had a couple of goes at it. One at average and one at sum.
The color is straight from the camera, with very little change by me of saturation.
I searched images of this object and found there are many color variations. I quite like the red, although I have seen some very beautiful ones with the surrounding objects a striking blue.
I have left the scope and camera parked in situ, so I can go for another 80 minutes or more later and add them to it.
Baz.
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